423. Leidy, Jos. A Fauna and Flora Within Living Animals. Smiths. Contr., vol. 5. 4to, 10 plates, paper cover separate. In this monograph Leidy’s earlier reputation largely originated. Rare. Wash., 1851.$1.25
424. Leidy, Jos. Fresh Water Rhizopods. Monograph. 4to, Vol. 12. U. S. Geol. Surv. Terr., 300 or more pages text and 48 colored plates. This is one of the most noted works of a great man.$2.50
425. Nicholson, H. A. Palæozoic Corals, the Structure and Affinities of the Genus Monticulipora and Sub-Genera. With descriptions of species. Royal 8vo, as new, 6 plates. Edinburgh, 1881.$1.25
426. Nutting, Chas. C. American Hydroids. Part 1, the Plumularidæ, with 34 plates. Wash., 1900. Part 2, Sertularidæ, 44 plates. Wash., 1904. Folio, orig. pr. covers, uncut, new, 2 vols. Wash., 1900, 1904.$1.75
427. Owen, Richard. Lectures on the Comparative Anatomy and Physiology of the Invertebrate Animals. Second ed. Fine copy in three-quarter mor., gilt tops, photo. of author, illus. by woodcuts, as new. Not a reprint, but revised and brought to date by Owen. London, 1855.$3.75
428. Owen, Richard. Same. First Ed. Illus. London, 1843.$2.00
429. Packard, A. S. Phyllopod Crustacea of N. America, Monograph on, with remarks on the Order Phyllocardia. As printed in 12th Ann. Report U. S. Geol. and Geographical Survey of the Territories. Part 1 for 1878. Pp. 295 to 592, plates 1-38, inclus. The complete vol., 786 pp., containing also articles on Osteology and Fossils. Wash., 1883.$3.00
430. Potts, Edward. Fresh Water Sponges. A Monograph. Illus., paper, uncut. Phila., 1887.$2.00
430A. Pritchard, Andrew. A History of Infusorial Animalcules, Living and Fossil. With Several Hundred Magnified Representations. New ed., enlarged. 704 pp., uncut, 24 finely colored plates. Autogr. inscription: “To Richard Owen, Esq., F. R. S., with the Author’s profound consideration.” Scarce. London, 1852.$8.00
431. Steenstrup, J. J. S. On the Alternation of Generations, or the Propagation and Development of Animals through Alternate Generations. A peculiar form of fostering the young in the lower classes of animals. 146 pp., 3 plates. London, 1845.$1.75